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Chapter 574 vacuum flask
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Chapter 576 aftermath of the rebellion
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... refully.
The main part of this thing is a metal tank. There are two valves at one end of the metal tank. One valve can only be opened inward, and the other valve can only be opened outward. A metal rod protrudes from the other end of the can, and this metal rod is connected by a movable circular shaft to a second metal rod, and the other end of the second metal rod is fixed on the edge of a rotating wheel , It is not accurate to describe it as fixed, because it is also placed on the runne ...
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